mirror of http://192.168.1.51:8099/lmh188/twain3.0
136 lines
5.6 KiB
C++
136 lines
5.6 KiB
C++
/* Traits for Outcome
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(C) 2018-2020 Niall Douglas <http://www.nedproductions.biz/> (8 commits)
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File Created: March 2018
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Boost Software License - Version 1.0 - August 17th, 2003
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Permission is hereby granted, free of charge, to any person or organization
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obtaining a copy of the software and accompanying documentation covered by
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this license (the "Software") to use, reproduce, display, distribute,
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execute, and transmit the Software, and to prepare derivative works of the
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Software, and to permit third-parties to whom the Software is furnished to
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do so, all subject to the following:
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The copyright notices in the Software and this entire statement, including
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the above license grant, this restriction and the following disclaimer,
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must be included in all copies of the Software, in whole or in part, and
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all derivative works of the Software, unless such copies or derivative
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works are solely in the form of machine-executable object code generated by
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a source language processor.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#ifndef BOOST_OUTCOME_TRAIT_HPP
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#define BOOST_OUTCOME_TRAIT_HPP
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#include "config.hpp"
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BOOST_OUTCOME_V2_NAMESPACE_BEGIN
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namespace trait
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{
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/*! AWAITING HUGO JSON CONVERSION TOOL
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SIGNATURE NOT RECOGNISED
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*/
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template <class R> //
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static constexpr bool type_can_be_used_in_basic_result = //
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(!std::is_reference<R>::value //
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&& !BOOST_OUTCOME_V2_NAMESPACE::detail::is_in_place_type_t<std::decay_t<R>>::value //
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&& !is_success_type<R> //
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&& !is_failure_type<R> //
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&& !std::is_array<R>::value //
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&& (std::is_void<R>::value || (std::is_object<R>::value //
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&& std::is_destructible<R>::value)) //
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);
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/*! AWAITING HUGO JSON CONVERSION TOOL
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type definition is_error_type. Potential doc page: NOT FOUND
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*/
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template <class E> struct is_error_type
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{
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static constexpr bool value = false;
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};
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/*! AWAITING HUGO JSON CONVERSION TOOL
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type definition is_error_type_enum. Potential doc page: NOT FOUND
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*/
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template <class E, class Enum> struct is_error_type_enum
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{
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static constexpr bool value = false;
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};
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namespace detail
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{
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template <class T> using devoid = BOOST_OUTCOME_V2_NAMESPACE::detail::devoid<T>;
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template <class T> std::add_rvalue_reference_t<devoid<T>> declval() noexcept;
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// From http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/n4436.pdf
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namespace detector_impl
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{
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template <class...> using void_t = void;
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template <class Default, class, template <class...> class Op, class... Args> struct detector
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{
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static constexpr bool value = false;
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using type = Default;
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};
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template <class Default, template <class...> class Op, class... Args> struct detector<Default, void_t<Op<Args...>>, Op, Args...>
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{
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static constexpr bool value = true;
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using type = Op<Args...>;
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};
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} // namespace detector_impl
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template <template <class...> class Op, class... Args> using is_detected = detector_impl::detector<void, void, Op, Args...>;
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template <class Arg> using result_of_make_error_code = decltype(make_error_code(declval<Arg>()));
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template <class Arg> using introspect_make_error_code = is_detected<result_of_make_error_code, Arg>;
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template <class Arg> using result_of_make_exception_ptr = decltype(make_exception_ptr(declval<Arg>()));
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template <class Arg> using introspect_make_exception_ptr = is_detected<result_of_make_exception_ptr, Arg>;
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template <class T> struct _is_error_code_available
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{
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static constexpr bool value = detail::introspect_make_error_code<T>::value;
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using type = typename detail::introspect_make_error_code<T>::type;
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};
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template <class T> struct _is_exception_ptr_available
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{
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static constexpr bool value = detail::introspect_make_exception_ptr<T>::value;
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using type = typename detail::introspect_make_exception_ptr<T>::type;
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};
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} // namespace detail
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/*! AWAITING HUGO JSON CONVERSION TOOL
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type definition is_error_code_available. Potential doc page: NOT FOUND
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*/
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template <class T> struct is_error_code_available
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{
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static constexpr bool value = detail::_is_error_code_available<std::decay_t<T>>::value;
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using type = typename detail::_is_error_code_available<std::decay_t<T>>::type;
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};
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template <class T> constexpr bool is_error_code_available_v = detail::_is_error_code_available<std::decay_t<T>>::value;
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/*! AWAITING HUGO JSON CONVERSION TOOL
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type definition is_exception_ptr_available. Potential doc page: NOT FOUND
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*/
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template <class T> struct is_exception_ptr_available
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{
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static constexpr bool value = detail::_is_exception_ptr_available<std::decay_t<T>>::value;
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using type = typename detail::_is_exception_ptr_available<std::decay_t<T>>::type;
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};
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template <class T> constexpr bool is_exception_ptr_available_v = detail::_is_exception_ptr_available<std::decay_t<T>>::value;
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} // namespace trait
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BOOST_OUTCOME_V2_NAMESPACE_END
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#endif
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